Handle for rock drills



Nov. 22, 1932. E. F. TERRY HANDLE FOR ROCK DRILLS Filed Aug. 7, 1950 2 Sheets-Sheet l INVENTOR. 17? snail? 121%? w w HIS A TTORNEY' \aagaaaaamaaa. 5 43/ aaaa m Nov. 22, 1932. .E. F. TERRY HANDLE FOR ROCK DRILLS Filed Aug. 7, 1930 2 Sheets-Sheet 2 INVENTOR. Edwaz'dFTcmy.

H15 ATTORNEY EDWARD F. TERRY, OF PHILLIPSBURG, NEW JERSEY, ASSIGNOR T INGEE-SOLL-RAND,

Patented Nov. 22, 1932 UNITED STATES PATENT OFFICE- COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY HANDLE FOR ROCK DRILLS Application filed August 7, 1930. Serial No. 473,744.

This invention relates to rock drills, but more particularly to a handle for rock drills of the drifter type which are generally guided and supported in operative position by a cradle or other similar means. )Usually the cylinder of the rock drill is provided with guide ribs adapted to extend slidably into guideways in the cradle, and the drill'is advanced toward the work and retracted therefrom by a feeding device, as for example, a feed screw which may cooperate with a threaded portion of the rock drill and is anchored at its extremities to the cradle to prevent longitudinal movement of the feed screw with respect to the cradle.

The present invention is moreparticularly, though not exclusively, intended for use on light weight drifters of which the weight is such that the drifter may be conveniently manipulated by one attendant.

The objects of the invention therefore are to render a rock drill of the drifter type capable for use as a hand held drill, to prevent the transmission of shock and vibrations from the drill to the operator, and to enable the handle to be readily attached to or removed from the drill. v

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawings accompanying this speclfication and forming a part thereof and in which similar reference characters refer to similar parts,

Figure 1 is a sectional elevation of a handle constructed in accordance with the practice of the invention,

Figure 2 is a transverse view taken through Figure 1 on the line 22 looking in the direction indicated by the arrows,

Figure 3 is an elevation partly in section taken on the line 33 of Figure 1 looking in the direction indicated by the arrows,

Figure 4 is an elevation in section taken on the line H in Figure 1 and looking in the direction indicated by the arrows.

Referring more particularly to the drawings, the handle designated generally by A is shown applied to a rock drill of which only a portion of the cylinder B and a front head C are illustrated in Figure 3. In Figure 2 a portion of a back head D is shown as arranged at the rear end of the cylinder B to which it may be suitably secured, as may also be the front head C, by spring pressed side bolts E.

a The cylinder B is illustrated as being provided with the usual hollow lug F at its rear end for the reception of a feed nut '(not shown) and which, as is well understood, is held against endwise movement in the lug F and is adapted to accommodate a feed screw (not shown) Wherewith cradles forming mountings for rock drills of the drifter type are commonly equipped for actuating the rock drill relatively to its cradle when used as a drifter.

On opposite sides of the lug F are the usual guide ribs G which extend along the opposite sides of, and from one extremity to the other of the cylinder to slide in guideways of a cradle forming a mounting for the drill.

The handle constructed in accordance with the practice of the invention is adapted to be attached to the rock drill and, in the form of the construction shown, to be clamped to the guide ribs Gr shown in dot and dash lines in Figure 1. It comprises rear and front plates H and J respectivelyhaving apertures K therein to accommodate bolts L having nuts 0 whereby the plates H and J may be clamped securely in position.

8 Each plate H and J is provided with a plurality of lugs P which are arranged in pairs and so spaced with respect to each other that when the extremities of the guide ribs G are disposed between the several pairs of lugs, one lug of each pair will lie on the top surface and the other lug will lie on the bottom surface of the guide ribs G.

The plate H preferably seats only against the rear or upper end of the guide ribs G, and the plate J which seats against the front ends of the guide ribs G may be suitably curved or may be provided with a concave depression Q to avoid contact between said plate and the peripheral surface or surfaces of the casing parts of the rock drill, as for example, the cylinder B, the front head 0 or, as illustrated, an element such as a front cylinder washer R interposed between the cylinder B and the front head C.

The grip portion S of the handle preferably comprises a pair of outer grip members T and U and a grip member V arranged between the outer grip members. Each grip member is provided with a coaxial bore W to accommodate a bolt X having a nut Y whereby the grip members may be held in correct assembled position and be clamped securely to ether.

etween the ends of the intermediate grip member V and the outer grip members T and U are clamped legs Z which are provided at their opposite or free ends with bosses b having recesses or apertures c therein to receive the bolts L whereon the said bosses are adapted to slide.

The bosses b may be of substantial length in order to assure ample bearing surface between thesaid bosses and the bolts, and the front and rear ends of the said bosses constitute in this instance seats (Z and 6 respectively for springs f and g. The springs f are interposed between the seats d and the plate J against which they seat with their front ends, while the springs g are interposed between the seats 6 and the plate H which serves as seats for the rear ends of the springs g. Owing to this arrangement the bosses will be held suspended between the plates by the springs and the springs will cushion any relative movement between the drill and the handle.

In addition to the bosses Z) the handle may be provided with means intended to maintain the legs Z in approximate alignment with the bolts L. The means illustrated for this purpose comprises projections h on the opposite ends of the plate H which extend into grooves 7' extending longitudinally of the legs Z and on the inner surfaces thereof.

.The handle may be readily attached to a rock idrill of the drifter type upon first disconnecting the rock drill from the cradle and its feeding device, such as a feed screw. Thereafter the plates H and J may be seated against the extremities of the guide ribs G and the legs Z be placed in substantially the position which these elements occupy when assembled on the rock drill.

The springs f and 9 may then be interposed between the bosses and the plates against which they seat and the bolts L are extended through the plates, the springs and the bosses, after which the nuts 0 may be threaded on the bolts L to clamp the plates H and J fixedly in position. Thus assembled and guided, the legs Z will be in the correct position to receive the grip portion V of the handle.

Where, as illustrated, the ends of the intermediate grip member V are seated in depressions in the inner surface of the legs Z, the free or rear ends of the legs may be slightly spread apart to enable the intermediate grip portion to be placed in position. The gri portion U may then be placed on the bolt and the said bolt extended through the intermediate grip portion V and the legs Z. Thereafter the grip portion S is placed on the bolt X and the nut Y threaded on the bolt to clamp the elements comprising the grip portion together and also to hold the free ends of the legs Z correctly spaced with respect to each other so that during operation, when the rock drill is being supported by the handle, the legs Z will be free to move with respect to the bolts L and to the projections it without causing binding between these elements.

,In the operation of the device any jars and shock resulting from the reciprocations of the percussive element of the rock drill or from other causes will be absorbed by the springs interposed between the plates 1-1 and J of the bosses b of the handle instead of being transmitted to the grip portion S.

In practice thepresent invention has been found to be extremely efficient. One of its chief advantages resides in the fact that it may be readily applied to pie-assembled drills of the drifter type for converting such drills into tools of the hand held type and without necessitating the disorganization of the drill.

I claim:

1. A handle assembly adapted to be attached to a pre-assembled rock drill and comprising a pair of plates, bolts for clamping the plates rigidly to the rock drill and being removable with the handle assembly, a grip portion having a pair of legs slidable on the bolts, and springs on the bolts acting against the legs to cushion the movement of the grip portion.

2. A handle assembly adapted to be attached to a pro-assembled rock drill and comprising in combination with a cylinder, a pair of plates adapted to seat against the cylinder and being removable with the handle assembly, bolts for clamping the plates fixedly to the cylinder, a grip portion, legs for the grip portion and being slidable on the bolts, and springs on the bolts acting against the legs to cushion the movement of the grip portion.

3. A handle assembly adapted to be attached to a pre-assembled rock drill and comprising in combination with a rock drill cylinder and guide ribs thereon, a pair of plates adapted to seat against the extremities of the guide ribs, bolts for clamping the plates rigidly to the guide ribs, a grip portion, legs for the grip portion having recessed bosses slidable on the bolts, and springs on the bolts and seating against the plates and the bosses to cushion the movement of the grip portion relatively to the rock drill.

4. A handle assembly adapted to be attached to a pie-assembled rock drill and comprising in combination with a rock drill cylinder having integral guide ribs, a pair of plates adapted to seat against and to engage the extremities of the guide ribs, bolts for clamping the plates rigidly to the guide ribs, a grip portion, legs for the grip portion and having recessed bosses slidable on the bolts, and a plurality of springs on each bolt and acting against the bosses and the plates for cushioning the movement of the grip portion relatively to the rock drill.

5. A handle assembly adapted to be attached to a pre-assembled rock drill and comprising in combination with a cylinder and guide ribs thereon, rear and front plates adapted to seat against the ends of the guide ribs, lugs on the plates to engage the sides of the guide ribs, bolts for clamping the plates rigidly to the guide ribs, a grip portion, legs for the grip portion having recessed bosses slidable on the bolts, and springs acting against the opposite ends of the bosses to hold the bosses suspended between the plates and to cushion the movement of the grip portion with respect to the rock drill.

6. A handle assembly for rock drills comprising in combination with a cylinder and guide ribs thereon, rear and front plates adapted to seat against the guide ribs, lugs on the plates arranged in pairs to engage opposed sides of the guide ribs, means for clamping the plates to the guide ribs, a grip portion legs for the grip portion having recessed bosses slidable on the said means, springs interposed between the bosses and the plates to cushion the movement of the gripportion relatively to the rock drill, and means on the legs and on one plate interlocked slidably to maintain the legs in alignment with the said means.

7 A handle assembly for rock drills comprising in combination with a cylinder and guide ribs thereon, rear and front plates adapted to seat against the guide ribs, lugs on the plates arranged in pairs to engage opposed sides of the guide ribs, means for clamping the plates to the guide ribs, a grip portion, legs for the grip portion having recessed bosses slidable on the said means, springs interposed between the bosses and the plates to cushion the movement of the grip portion relatively to the rock drill, projections on the ends of the rear plate, and grooves in the legs to receive the projections for maintaining the legs in alignment with the said means.

In testimony whereof I have signed this specification.

EDWARD F. TERRY. 

